CN204365768U - The shaping plug of one side's rectangular bend - Google Patents

Abstract

A mandrel for forming a square and rectangular elbow, which is formed by superimposing a number of sheets in the height direction, the stacking direction of the sheets is the bending direction of the square and rectangular elbow, and the stacking height of the sheets is 1-3 mm smaller than the inner cavity height of the square and rectangular elbow; The thickness of the sheet is 0.6-1.5 mm; the mandrel is provided with a chamfer matching the R angle of the inner cavity of the square rectangular elbow, and the chamfer of the mandrel is larger than the R angle of the inner cavity of the square rectangular elbow. The mandrel of the utility model solves the problem that it is difficult to provide a suitable mandrel to meet the requirements of fixed length, high precision, multi-curvature and small-radius bending of square and rectangular tubes under the existing conditions, and has the characteristics of low cost, high versatility, high flexibility and the like.

Description

Mandrel for forming square and rectangular pipes

technical field

The utility model relates to the technical field of bent pipe forming, in particular to a mandrel for forming square and rectangular bent pipes.

Background technique

During the bending and deformation process of the pipe, the stress modes of the inner and outer sides of the neutral layer are inconsistent, the outer material of the neutral layer is elongated by tension, and the inner material of the neutral layer is piled up by pressure. With the decrease of the wall thickness and bending radius of the pipe, the outer side of the neutral layer is prone to indentation and cracking, and the inner side of the neutral layer is prone to wrinkle instability, the bending effect is poor, and even bending failure occurs.

With the development of the national economy, the demand for bent pipes from all walks of life, especially the demand for thin-walled, multi-curvature and small-radius bent pipes, has grown rapidly. high demands. At present, the method of adding a mandrel is generally used to ensure the bending effect of the pipe. However, the square rectangular pipe commonly used in the automobile and other industries has the characteristics of fixed length, small bending radius, complex bending curvature, and high bending accuracy. Considering the mandrel The cost, versatility, flexibility and other requirements of the existing ball joint mandrel and other forms are difficult to meet the actual needs of high efficiency, low cost, and high-quality bending.

Contents of the invention

The purpose of the utility model is to design a mandrel for forming square and rectangular bent pipes, which solves the problem that it is difficult to provide a suitable mandrel to meet the requirements of square and rectangular pipes with fixed length, high precision, multiple curvatures, and small radius bending under existing conditions. Low cost, high versatility, high flexibility and other characteristics.

For achieving the above object, the technical scheme that the utility model adopts is,

A mandrel for forming a square and rectangular elbow, characterized in that it is formed by superimposing a number of thin sheets in the height direction, the stacking direction of the thin slices is the bending direction of the square and rectangular elbow, and the stacking height of the thin slices is smaller than the inner cavity height of the square and rectangular elbow 1-3mm; the thickness of the sheet is 0.6-1.5mm; the mandrel is provided with a chamfer matching the R angle of the inner cavity of the square rectangular elbow, and the chamfer of the mandrel is larger than the R angle of the inner cavity of the square rectangular elbow .

Preferably, the width direction of the sheet must ensure that the gap between the soft mandrel of the sheet and the inner cavity of the tube is 1-3 mm on one side.

Preferably, one end of the slices is welded and fixed during assembly, and is polished; the other end of the slices is not subject to any constraints during assembly, and the front end is treated with a circular arc transition.

Preferably, the chamfer of the mandrel has five specifications of R2mm, R4mm, R6mm, R8mm and R10mm.

The used sheet thickness of the mandrel of the utility model is 0.6-1.5mm, and the material is Q195D or Q235B through bluing treatment. According to the different dimensions of the curved pipe, the thin-sheet soft mandrel adopts different numbers of thin sheets to be superimposed in the height direction. Since the stacking direction of the thin sheets is the bending direction of the square and rectangular pipe, in order to ensure the bending quality of the pipe, the stacking height of the thin sheets must be higher than that of the square and rectangular pipe. The inner cavity height is 1-3mm smaller. For welded pipes without deburring, if the weld is located in this direction, the gap between the thin soft mandrel and the burrs in the weld should be guaranteed to be 0.5-1.5mm.

The width direction of the sheet soft mandrel, that is, the width direction of the mandrel sheet, is perpendicular to the bending direction of the square and rectangular pipe. In order to improve the bending effect of the square and rectangular pipe, it is necessary to ensure that the unilateral gap between the thin sheet soft mandrel and the inner cavity of the pipe is within 1-3mm. For welded pipes that have not been deburred, if the weld is located in this direction, it should also be ensured that there is no excessive extrusion with the burrs in the weld.

At the same time, in order to ensure that the sheet soft mandrel can fill the inner cavity of the square and rectangular tube as much as possible during the bending process, it is necessary to process a chamfer close to the R angle of the inner cavity of the bent tube. Considering the versatility and low cost requirements of the thin-slice soft mandrel, the chamfer of the mandrel should be larger than the R angle of the pipe inner cavity. Five specifications of R4mm, R6mm, R8mm and R10mm.

In addition, on the premise of ensuring the bending quality of square and rectangular pipes, the convenience of using the thin sheet soft mandrel is ensured. When the thin sheet soft mandrel is assembled, one end is welded and fixed, and it is polished. According to the length of the mandrel, the length of the welding area is 100-300mm. The other end of the thin sheet soft mandrel does not impose any constraints when combined, and the front end is treated with a circular arc transition to ensure that the thin sheet mandrel can slide freely in the inner cavity of the pipe during bending, ensuring the bending quality of the square and rectangular pipe and reducing the core pulling of the mandrel Force demands.

Compared with the existing mandrel design form, the utility model has the following advantages:

In the actual bending process of square and rectangular pipes, especially in the thin-walled, complex curvature, and small-radius bending process, the utility model effectively improves the bending quality and bending accuracy of square and rectangular pipes, and the inner and outer collapses and external dimensions of the bend Fluctuations, etc. have been effectively controlled. The thin sheet soft mandrel of the utility model has the advantages of high flexibility, strong versatility, low cost, standardized processing and long service life, and is especially suitable for long-length, high-precision, complex curvature and small-radius bending of square and rectangular pipes.

Description of drawings

Fig. 1 is the mandrel sheet structural representation of the utility model;

Fig. 2 is a preliminary structural representation of the utility model;

Fig. 3 is a schematic diagram of the actual use of the utility model.

Detailed ways

Referring to Figures 1 to 3, a mandrel 2 for forming a square and rectangular elbow of the present invention is formed by superimposing a number of sheets 1 in the height direction, and the stacking direction of the sheets 1 is the bending direction of the square and rectangular elbow 100. The superimposed height of the sheet 1 is 1-3 mm smaller than the height of the inner cavity of the rectangular elbow 100; for a welded pipe without deburring, if the weld is located in this direction, the gap between the sheet and the burrs in the weld is 0.5-1.5 mm; the sheet 1. The thickness is 0.6-1.5 mm; the mandrel 2 is provided with a chamfer matching the R angle of the inner cavity of the square rectangular elbow 100, and the chamfer of the mandrel 2 is larger than the R angle of the inner cavity of the square rectangular elbow 100.

Preferably, the width direction of the sheet 1 must ensure that the one-side gap between the sheet soft mandrel and the inner cavity of the tube is 1-3 mm.

Preferably, one end of the slices is fixed by welding and polished, and the length of the welded area is 100-300 mm according to the length of the mandrel; the other end of the slices is combined without any constraints, and the front end is treated with a circular arc transition.

Preferably, the chamfer of the mandrel 2 has five specifications of R2mm, R4mm, R6mm, R8mm and R10mm.

The utility model effectively improves the bending quality and bending accuracy of square and rectangular pipes, effectively controls the inner and outer collapse of the bent pipe and the fluctuation of the outer dimension, and is suitable for long-length, high-precision, complex curvature and small square-rectangular pipes. Radius bend.

Claims (5)

1. the shaping plug of square rectangular bend, is characterized in that, adopts some thin slices to be formed by stacking in the height direction, the bending direction of the thin slice Direction of superposition side of being rectangular bend, and thin slice superposition highly suppose the little 1-3mm of cavity heights of rectangular bend; Described sheet thickness is 0.6 ~ 1.5mm; Described plug establishes the chamfering matched with square rectangular bend inner chamber R angle, and, this rectangular bend inner chamber R angle, plug chamfering side of being greater than.

2. the shaping plug of side's rectangular bend as claimed in claim 1, is characterized in that, the width of the thin slice of described plug must ensure that the one-sided gap of the soft plug of thin slice and tubing inner chamber is at 1 ~ 3mm.

3. the shaping plug of side's rectangular bend as claimed in claim 1 or 2, is characterized in that, the thin slice of described plug is welded and fixed one end when combining, and makes grinding process, and according to the difference of plug length, welding region length is 100 ~ 300mm; Thin slice other end when combining does not apply any constraint, and arc transition process is done in front end.

4. the shaping plug of side's rectangular bend as claimed in claim 1 or 2, is characterized in that, the chamfering of described plug is R2mm, R4mm, R6mm, R8mm and R10mm five kinds of specifications.

5. the shaping plug of side's rectangular bend as claimed in claim 3, is characterized in that, the chamfering of described plug is R2mm, R4mm, R6mm, R8mm and R10mm five kinds of specifications.